DB929B datasheet(7/51 Pages) CMLMICRO

7 / 51 page

4-Level FSK Modem Data Pump

Page 7 of 50

MX929B PRELIMINARY INFORMATION

www.mxcom.com Tel: 800 638 5577 336 744 5050

Fax: 336 744 5054

Doc. # 20480171.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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2. Signal List

Pin No.

Signal

Type

Description

IRQ

output

A 'wire-ORable' output for connection to the host

PC's Interrupt

Request input. When active, this output has a low impedance

pull down to VSS. It has high impedance when inactive.

BUS

Pins 2-9 (D7-D0) are 8-bit, bi-directional,

3-state

PC interface data lines

input

Read. An active low logic level input used to control the reading

of data from the modem into the host

PC.

input

Write. An active low logic level input used to control the writing

of data into the modem from the host

PC.

VSS

power

Negative supply (ground).

input

Chip Select. An active low logic level input to the modem used

to enable a data read or write operation.

input

Logic level modem register select input

input

Logic level modem register select input

XTAL

output

Output of the on-chip oscillator.

XTAL/CLOCK

input

Input to the on-chip oscillator, for an external Xtal circuit or

clock.

DOC 2

output

Connection to the Rx level measurement circuitry. Should be

capacitive coupled to VSS.

DOC 1

output

Connection to the Rx level measurement circuitry. Should be

capacitive coupled to VSS

TXOUT

output

Tx signal output from the modem.

VBIAS

output

A bias line for the internal circuitry held at VDD /2. This pin must

be bypassed to VSS by a capacitor mounted close to the device

pins.

RXIN

input

Input to the Rx input amplifier.

RXAMPOUT

output

Output of the Rx input amplifier.

VDD

power

Positive supply. Levels and voltages are dependent upon this

supply. This pin should be bypassed to VSS by a capacitor

mounted close to the device pins.

Note: Internal protection diodes are connected from each signal pin to VDD and VSS.

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